Su Zhiheng, a talented perfumer, inherited the legacy of his late father and took charge of the precarious "Hengwu Incense Shop". In her eyes, spices are not only pleasant, but also contain deadly mysteries. When aphrodisiac incense conceals nerve poisons and ecstasy incense erodes the memory palace, she builds a "Fragrance Toxicology Library" based on a book called "Secret Records of Incense", uses organic synthesis to resolve invisible poisons, and uses "chemical ecology" to examine the hidden effects of spices on flowers, birds, fish and insects. Faced with the abuse of incense and poison by the powerful and the turbulent undercurrents in the royal family, Su Zhiheng resolutely founded the "Hengwu Toxicology Laboratory". With a furnace of cinnabar and a few herbs, she peeled off the cocoon and exposed the poisonous murders in the palace. She used rigorous toxicology reports as a blade to point out the judicial obscurity. This is a righteous battle written in molecular formulas. A perfumer used chemical ecology to leverage the ancient criminal law, and finally made the "Fragrance and Poison Control Regulations" known to the world. In a dynasty where fragrance and poison are intertwined, a legend of fragrance and punishment was created.